Field-magnet.



B. A..BEHP.END.

FIELD MAGNET. Awuofurxou FILED MAY 14, 1904, RBNBWBD JULY 29, 1907.

Patented Apr.20, 1909.

2 SHEETS-SHEET l.

B. A. BBHREND.

FIELD MAGNET. APPLICATION FILED MAY 14, 1904. RENBWBD JULY 29. 1907. I

918,499. Panama A101120, 1909.

2 SHEETS-SHEET 2,

UNITED sTATEs PATENT oEEicE.

BERNARD ARTHUR BEHREND, OF NORWOOD, OHIO, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO THE BULLOCK ELECTRIC MANUFACTURING CO., A CORPORATION OF OHIO, .AND ALLIS-CHALMERSCOMPANY, A CORPORATION OF NEW JERSEY.

FIELD-MAGNET.

Specification of Iietters Patent.

Patented April 20, 1909.

Application filed May 14, 1904, Serial No. 207,921. Renewed July 29, 1907. Serial No. 385,998.

To all whom 'Lt may concern:

Be it knownV that I, BERNARD ARTHUR BEHREND, a citizen ofthe United States, residing at Norwood, in the county of Hamilton and -State of Ohio, have invented certain new and useful Improvements in Field- Magnets, of which the following is a full, clear, and exact speciiication.

My invention relates to dynamo electric machinery and particularly to revolving field magnets.

The 'object-of my invention is to provide a field. magnet construction adapted for very high speeds such -as is necessary in generators directly connected to steam turbines. At such high speeds the usual constructions are not adapted to'withstand the'enormous centrifugal Astrains developedand special construction of certain parts is necessary.

The subject matter of the present application relates particularly to means for supportin and protecting the windings, certain ot er improvements being herein shown and described but which are claimed in my co-pending application liled' April 9, 19011,- Serial Number 202353.

In usual constructions the field coils are retained inposition by the pole tips and flanges on `the end plates and the larger component of the centrifugal force on .the windings is directed against the said tips. In hi h s eed machines however, the number o po es becomes very small and their size 'is increased which results in greatly increasing the component of the centrifugal force exerted on the Winding in a direction at right angles to the sides of the pole. This component causes the coils to be thrownoutwardly at the sides and my present in vention relates to the overcoming of such displacement or tendency.

- vMy invention will be understood from the following description and accompanying drawings and the novelty thereof'will be more definitely set forth in the claims.

Figure 1 is a part longitudinal section and part side view of a revolvingeld inagnet embodying my invention; Fig. 2 is an enlarged part cross section and part end Viewvof the same. 1 U

The supporting element comprises a solid integral member and in the present instance is shown as carrying-four poles. It is specially4 designedl to have great mechanical strength and at-the, same time fulfil the magnetic requirements.l The body portion l is square in section and is slotted to receive the l,dovetails 2 ofthe pole pieces. The body por-4 tion is provided with gradually tapering integral extensions 3v which reduceto the vsup'- porting journals 4. The wholev is made of somematerial having great mechanical strength Y and high, magnetic permeability such as forged nickel steel.

The pole pieces are built up of lamin 5 secured to the supporting element by doveltails. The laminas are clamped between the end plates 6 by-means of the through bolts 7 The coil forI each pole piece is subdivided into an inner part'8 and an outer part l8 and separated by a spacer 9 of suitable material which encircles the pole. The coil is located between the core and the extensions 10 of the pole. On the sides of the pole p ieces and over the windings are placed plates 11 for retaining the windings in place and protecting the same. The plates are shown as notched into the core 1 at their .inner edges, and engaged by the tips 12 of the pole pieces at their outer edges. The plates are retained in position by the vbolts 13 which pass through the pole pieces and' plates, the nuts 14 of the bolts bein shown recessed into the side plates. The olts 13 pass between the divided portions of the coils and through holes provided in the spacers 9 which may be solideXcept for the openings for the bolts 13 vor may be of skeleton foi-m, or if desired may consist simply of blocks placed between the bolts 18.

The end turns of the coils are shown as protected and supported by U shaped cast:

ings 15, the ends of the same being provided with dove tails 16 which engage the core 1. The windings pass from under the plates 11 and into the spaces between the arms of the castings 15 and `thus all parts are firmly held in position. rThe spacing blocks 17 are placed between the dove tail projections of the U shaped members 15. 'The outer ends of members 15 are held in place by the through bolts 18. The pole pieces are pre.- vented from moving sidewise by the end plates 19, shown partly broken away in Fig. 2, and which are secured to the core bythe bolts 20. The usual collector rings 21 are Having thus described my invention, I de- Clare that what I claim as new and desire t secure by Letters Patent, isv l. In a dynamo electric machine, fthe comi bination' with the revolving element and field magnets thereon, of side `supports for the windings of said field magnets, and means passing into the pole pieces and between parts of the winding for each pole piece for retaining the said supports in position, substantially as described. I

2. In a dynamo electric machine, the combination with the revolving element and field magnets thereon, ofl vs ide supports for the windings of said field magnets, and bolts passing through the pole pieces for retaining the side supports in position, substantially as described.

3. In a dynamo electric machine, the combination with the revolvin .element and Vfield magnets thereon, of side p ates for the windings of said field magnets,and means passing through the pole pieces and windings for retaining 'said plates in tially as d escribed.

4. In a dynamo electric machine, the coinbination with the revolving' elementand pole pieces thereon, of a divided winding for each pole piece, side supports for the windings,

and means passing through the pole piecesA and between the parts of the divided -windings for retaining said side supports in position, substantially as described.

5. In a dynamoelectriemachine, thecombination with therevolving element and pole pieces thereon, of a dlvided winding for each'pole ieee, side supports for the, W1ndings exten 4ing between the core. and tipsof the polepeces, and meansfp'assmg through the pole pieces for retain-in said side sup-" ports in position, substantia ly .as described.

-giecesand passing between the parts of the position, substanA i l0. In a 'dynamo velectric v6. In a dynamo electric machine, the com- V4 bination with the revolvin element and pole pieces thereon, of a divided winding for each pole piece, said winding being 'seated between the core and extensions onthe pole pieces, 'side' supports for the windings extending between the core and pole tips, and means passing through the pole pieces and between the parts 'of the divided windings for retaining saidside supports in position, substantially as described.

7. In a dynamo electric machine, the combination with the revolving element and field magnets thereon, of side ,supports for the windings of said magnets, and means engaging the pole pieces and extending between parts of the winding for each pole piece for retaining the said supports in position.

8. In a dynamo electric machine, the com.

-bination with the revolving element and field magnets thereon, of side plates for thewi'nd-IO ings of said field magnets, and'means engag-` ing the pole pieces and passing through the windings for retain-ing said plates in posi-` tion.

9. In a dynamo electric machine, the combination with the revolving element and pole pieces thereon, of a divided winding for eachof said pole pieces, side supports for the windings, and means vengaging the` pole ivided windings for retaining' said side supports m posi-tion.

machine, the combination with the revolving element and pieces thereon, of a divided winding 'for each pole piece, lside supports for the wind`V ings Aextending between the core and tipsof the pole pieces, and means engaging-the pole pieces extending between the divided'fwln'd-V g of each pole piecefor retaining said side supports in position.'

' yIn testimony whereof I aiiix' my signature-,yV in .presence-of two witnesses.

BEREARD ARTHUR Bauman Witnesses z FLonnNoE Mumia, vGarantire E: 

